From 1e0f0ed99cf55a7cf52657cf7d06ee3ee5e37e3e Mon Sep 17 00:00:00 2001
From: Clownacy <Clownacy@users.noreply.github.com>
Date: Wed, 1 Apr 2020 22:42:27 +0100
Subject: [PATCH] Add pkg-config GLFW3 support

---
 CMakeLists.txt | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4365e462..527193e5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -406,8 +406,32 @@ if(NOT FORCE_LOCAL_LIBS)
 endif()
 
 if(BACKEND_PLATFORM MATCHES "GLFW3")
-	find_package(glfw3 REQUIRED)
-	target_link_libraries(CSE2 PRIVATE glfw)
+	if(NOT FORCE_LOCAL_LIBS)
+		find_package(glfw3)
+
+		if (PKG_CONFIG_FOUND)
+			pkg_check_modules(glfw3 QUIET glfw3)
+		endif()
+	endif()
+
+	if(glfw3_FOUND)
+		# pkg-config
+		if (PKG_CONFIG_STATIC_LIBS)
+			message(STATUS "Using system GLFW3 (pkg-config, static)")
+			target_compile_options(CSE2 PRIVATE ${glfw3_STATIC_CFLAGS})
+			target_link_libraries(CSE2 PRIVATE ${glfw3_STATIC_LIBRARIES})
+		else()
+			message(STATUS "Using system GLFW3 (pkg-config, dynamic)")
+			target_compile_options(CSE2 PRIVATE ${glfw3_CFLAGS})
+			target_link_libraries(CSE2 PRIVATE ${glfw3_LIBRARIES})
+		endif()
+	elseif(TARGET glfw)
+		# CMake
+		message(STATUS "Using system GLFW3 (CMake)")
+		target_link_libraries(CSE2 PRIVATE glfw)
+	else()
+		message(FATAL_ERROR "Couldn't find GLFW3")
+	endif()
 endif()
 
 if(BACKEND_PLATFORM MATCHES "SDL2" OR BACKEND_AUDIO MATCHES "SDL2")